Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8daa5de341ab09…

MALICIOUS

PDF

74.1 KB Created: 2020-12-26 17:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3445eb6ad046b398af52a6dbbdc062ac SHA-1: 1106f414d9ddc1750e5e7bf75ac903539c2ce052 SHA-256: 4d8daa5de341ab094b9031ccfb268642a90e2f5942e6884386b2e90aee19be0a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/strik?utm_term=teacher+appreciation+week+ideas+quotes PDF link annotation
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/bimegapelemago-mabusemirij.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/fY1egg3/bloodsport_movie_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejeni/gcO3rP2/dozok.pdfIn PDF document text
    • https://vutuzanepe.weebly.com/uploads/1/3/1/4/131453188/luvefisifodilutu.pdfIn PDF document text
    • https://naduwabale.weebly.com/uploads/1/3/4/6/134651235/rarajixoxumuj_pazadusujagotat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c547c76-7bc1-4315-83ac-40a5344ee4cc/73939936699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7151b283-ccd5-4015-830c-f468d3d985ab/roguelike_adventures_and_dungeons_mi.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/10264262058.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/foamed_aluminum_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/afrikaans_english_dictionary_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d4f85c-cba4-496b-bb30-da28a73c53a1/conductores_aislantes_y_semiconducto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7252302d-f28b-42bd-bd18-ee35bdab064e/off_road_4x4_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef3c2e9-a8c5-4cab-8edc-801375466be0/hamilton_khaki_mechanical_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f719de-5e4f-4fbc-8e87-329a3b5409c8/whitetail_deer_for_sale_in_ohio.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 5360 bytes
SHA-256: c7f048b251b9f9d0232b1e89ce6457f1bd21a90b82cef4dc0347c4f50677bcc7
font_01_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 10276 bytes
SHA-256: 1cda4f9e5ff0eae6f4673dc9bcd9f5b196b8a41bda33c60c29f7453d24204d20

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